JP2834357B2 - Lightning protection devices in distribution lines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning arrester for a distribution line, and more particularly to a lightning arrester for efficiently flowing a lightning current flowing into an overhead ground line of a distribution line into the ground through a lightning conductor. .

[0002]

2. Description of the Related Art Distribution lines have a low insulation level and a lightning surge withstand voltage of about 100 kV. For this reason, induced lightning is mainly dealt with by installing overhead ground wires, lightning arrestors, lightning-resistant PCs, and the like. However, since the lightning surge voltage of a direct lightning strike is as large as about 300 kV, it is difficult at present to prevent a power line failure due to a direct lightning strike and a breakdown of equipment. For this reason, in areas where lightning strikes frequently occur, the burden of securing spare parts for restoration and arranging workers is excessive, which hinders normal operations.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, an object of the present invention is to suppress an increase in the potential of a distribution pole and to protect distribution equipment from dielectric breakdown.

[0004]

A lightning protection device for a distribution line comprises a power distribution pole 1, an overhead ground wire 2 and a lightning conductor 3, and the power distribution pole 1 has an upper arm 4 at the top. The lower arm 4 'is provided with a lower arm 4' at the center and an overhead ground wire support 4a at the center, and a lightning conductor lowering arm 4b at the lower part on both sides. Is provided with a pair of turn buckles 4b 'incorporating a spring 9 for tensioning the lightning conductor 3, and the overhead ground wire 2 is a bare wire erected on the top of the power distribution pole 1 and imaginary for the upper arm 4 Ground wire bracket 4a
The lightning conductor 3 is extended in a state of being electrically insulated from the power distribution pole 1 and the upper arm 4 by being passed through a pin insulator 5 fixed thereon. -Bu 7
Are electrically and mechanically connected to each other, and the lower ends are grounded. Further, they are passed through pin insulators 5 fixed to both ends of the upper arm 4 and are used to pull down the lightning conductor 4b. And attached to a clamping clamp 8 having a structure incorporating a wedge having teeth that bites through the covering material of the lightning conductor 3 and bites into the conductor. The wedge and the clamp body of the anchoring clamp are electrically insulated from each other, and the lower end is mounted on the lower arm 4 'via the turn buckle 4b'. It is fastened to a retaining clamp 8 'attached via 6'.

[0005]

According to the lightning protection device in the distribution line having the above configuration,
The lightning current flowing into the overhead ground wire of the distribution line flows through the lightning conductor 3 to the ground. Therefore, a potential rise of the power distribution pole 1 due to a lightning current is suppressed, and dielectric breakdown of the power distribution equipment is prevented.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a lightning protection device in a distribution line according to an embodiment of the present invention. The lightning protection device mainly includes a power distribution pole 1, an overhead ground wire 2, and a lightning conductor 3.

The power distribution pole 1 is a pole-type power pole, having an upper arm 4 at the top and a lower arm 4 'at the bottom. The upper arm 4 is an overhead ground wire support 4a at the center.
And a pair of lightning conductor pull-down arms 4b on both sides are integrated, and attached to the distribution pole 1 with a band. The lower arm 4 ′ is a pair of turnbuckles 4 that tighten the lightning conductor 3.
b ′. A spring 9 is incorporated in the turn buckle 4b 'to absorb fluctuations in tension and vibration of the lightning conductor 3 and prevent slack.

The overhead ground wire 2 is a bare wire laid on the top of the distribution pole 1, and is generally made of a galvanized steel strand or a single copper wire. The imaginary ground wire 2 is an imaginary ground wire fitting of the upper arm 4
The overhead ground wire 2 is installed in a state in which it is electrically insulated from the power distribution pole 1 and the upper arm 4 by the pin insulator 5 fixed to 4a.

The lightning conductor 3 is a covered wire whose upper end is mechanically and electrically connected to the overhead ground wire 2 and a branch sleeve 7 and whose lower end is grounded. Is preferred. The branch sleeve 7 is connected to the ground wire 2 to be connected.
Is a galvanized steel strand, a lightning conductor (hard copper strand;
Since Cu) is a dissimilar metal, it is necessary that the connection portion be protected from electrolytic corrosion. In the present embodiment, an H-shaped compressed branch sleeve as shown in FIG. 4 is used to cope with this, but the branch sleeve may be a C-shaped branch sleeve.

The lightning conductor 3 is connected at its upper end by the branch sleeve 7 as described above, and is passed through a pin insulator 5 (refer to FIG. 2 for details) fixed to the end of the upper arm 4. It is. Then, a tension insulator 6 is attached to the arm 4b for lowering the lightning conductor.
(See FIG. 3 for details). Subsequently, the lightning conductor 3 is disposed in parallel with the distribution pole 1 from the anchoring clamp 8, and is retained by the anchoring clamp 8 'attached to the lower arm 4' via the tension insulator 6 '. .

The anchoring clamps 8, 8 'have a structure in which wedges having teeth that bite through the covering material of the lightning conductor 3 and bite into the conductor are incorporated (FIG. 5). So that it can be retained. Therefore, no special tool is required, and no waterproofing / insulation treatment is required.
Further, when the tension increases, the biting force increases due to the effect of the wedge, so there is no need to worry about slipping. Furthermore, since the wedge and the clamp body are insulated, electric shock due to induction and the like is prevented, and the teeth of the wedge are covered with a waterproof compound, so that rainwater may enter the wire coating. Absent. These effects can be further improved by using a waterproof insulating cover after mounting the clamp.

The tension of the lightning conductor 3 is set to about 100 kgf by a turn buckle 4b 'in order to prevent swaying and vibration caused by wind, and a tension is prevented by a spring 9.
In addition, the spacing between the lightning conductor 3 and the power distribution pole 1 is set to about 30 cm in order to ensure an insulation separation between the power distribution pole 1 and the power line supporting arm. For this reason, there is no need to install a support device between the anchoring clamps 8 and 8 'for preventing the steadying. As described later, there is no obstacle when the lightning conductor 3 is used as a lifting safety device. become.

[0013]

(1) Since the lightning conductor 3 is always under tension at its lower part by the turn buckle 4b 'and the spring 9, the fluctuation of the tension and vibration of the lightning conductor 3 can be absorbed and slack can be prevented. . (2) The upper end of the lightning conductor 3 is connected to the imaginary ground wire 2 and the branch line.
In the step 7, it is strongly connected not only electrically but also mechanically,
The lower end is a covered insulated wire that is grounded. The upper part of the lightning conductor 3 is clamped by a retaining clamp 8 attached to a pull-down arm 4b via a tensile insulator 6 at the upper part, and then the retaining clamp 8 Since the lightning conductor 3 is disposed downward parallel to the left and right along the distribution pole 1 and is secured to the lower clamp 4 'via a tension clamp 6' attached to the lower arm 4 'via a tension insulator 6', the steady rest is prevented. It is not necessary to provide a supporting device for
Can be used as a guide for the lifting safety device.

Further, since the lightning conductor 3 composed of a pair of insulated wires is arranged in parallel on both sides of the power distribution pole 1 along the power distribution pole 1, the lightning conductor 3 can be used as a guide for a lifting / lowering safety device during work. Therefore, installation of a separate lifting / lowering safety device can be omitted.

[Brief description of the drawings]

FIG. 1 is a front view of a lightning protection device in a distribution line according to an embodiment of the present invention.

FIG. 2 is a front view of a pin insulator.

FIG. 3 is a front view of a tension insulator.

4A is a front view of an H-shaped compression branch sleeve, and FIG. 4B is a side view of the same.

FIG. 5 (a) is a front view of a retaining clamp, and FIG. 5 (b) is an X of FIG. 5 (a).
-X sectional drawing, (c) is a top view similarly.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Distribution pole 2 Overhead ground wire 3 Lightning wire 4 Upper arm 4a Overhead wire support bracket 4b Arm for pulling down lightning wire 4 'Lower arm 4b' Turn buckle 5 Pin insulator 6, 6 'Tension insulator 7 Branch pick-up -Bu 8,8 'Retention clamp 9 Spring

──────────────────────────────────────────────────続 き Continued on the front page (72) Masao Yamauchi, Inventor 2-242, Fukuike, Tenpaku-ku, Nagoya-shi, Aichi Prefecture (72) Inventor, Takayasu Iida 943, Hongo, Fukushou-cho, Hashima-shi, Gifu Prefecture (72) Inventor, Hideaki Kikuchi Kanagawa 475 Hisamoto, Takatsu-ku, Kawasaki Prefecture, Japan Asahi Electric Co., Ltd. (56) References JP-A-61-164414 (JP, A) JP-A-54-119693 (JP, A) JP-A-3-235612 (JP, A) JP-A-51-80949 (JP, A) JP-A-3-235613 (JP, A) JP-A-61-98343 (JP, U) JP-A-12-7011 (JP, Y1) (58) Field (Int.Cl. ⁶ , DB name) H02G 13/00 H02G 7/00-7/22

Claims (1)

(57) [Claims] 1. A lightning arrester for a distribution line, comprising a power distribution pole (1), an overhead ground wire (2) and a lightning conductor (3), wherein the power distribution pole (1) has An arm bar (4) is provided with a lower arm bar (4 ') at the lower part, an upper arm bar (4) is provided with an overhead ground wire support bracket (4a) at the center, and a lightning wire pull-down arm is provided at the lower portion on both sides. (4b) is attached, and the lower arm (4 ') is provided with a pair of turn buckles (4b') incorporating a spring (9) to tension the lightning conductor (3). The ground wire (2) is passed through a pin insulator (5) fixed on an aerial ground wire fitting (4a) of an upper arm (4) by a bare wire erected on the top of the distribution pole (1). Distribution pole (1) and upper arm (4)
The lightning conductor (3) is mechanically and electrically connected at an upper end thereof to an aerial ground wire (2) and a branch sleeve (7), and has a lower end. It is a covered wire that is grounded, and is further passed through a pin insulator (5) fixed to both ends of the upper arm (4), and is attached to a lightning conductor pulling down arm (4b). 6), and is retained by a retaining clamp (8) having a structure incorporating a wedge having teeth that bites through the covering material of the lightning conductor (3) and bites into the conductor. The wedges and the clamp body of the retaining clamp are electrically insulated from each other, and the lower end is provided with a lower arm (4 ').
A lightning protection device for a distribution line, characterized in that the lightning protection device is secured to a retaining clamp (8 ') mounted on a tension insulator (6') mounted on the turn buckle (4b ').